Method for the manufacture of dutch tiles or slabs having a lustrous surface and article produced thereby



are still fresh and soft, a coating of a mix- 1 Patented Jan. 2,

' ,miawa To all whom it may concern;

Wilma "STMasQ-P Nf tsetse names.

erovaum MADDALENA, ornrnnnnununu,swirznntann.

METHOD roe THE [Be it known that l, GIOVANNI MADDALENA,

asubject of the King .of Italy, residing at' NiederurnemiSWitz'erland, have invented a Method 'for'th'e Manufacture of Dutch. Tiles orfJ-Slabs Having a Lustrous Surface and 3 :Articile Produced Thereby, of which the fol- "lowingis a specification.

A The present invention relates to improvements ina method for the manufacture of Du-tch tilesor Slabs having a lustrous surface and used for covering walls and the like. Y

' The improved method comprises applying to slabs made of asbestos-cement when they ture of a liquid paste of lime and pulverized an excess of free soda, and smoothing then the surface of the slabs.

- The methodlmay be carried into eifect in the following manner: The fresh made soft slabs of asbestos-cementare placed horizontally upon a working table and are uniformly covered by means of a large brush with athin layer or coating of a mixture of thin paste of lime and pulverized marble in a proper- .tion of five parts by volume of the thin paste of lime to one part by volume of pulverized marble. After the above mentioned mixture has been app-lied it is smoothed by means of a flatiron or a polishing sleeker until the surface appears to perfectly smooth.

As said mixture is applied to the slabs when the latter are still in their-soft state this mixture is united to the slab by the simultaneous binding action sothat it adheres firmly and does not peel 03. I

,As soon as the .first procedure is finished a further coating of the mixture consisting of, for instance, 4 parts by volume of milk of lime and 1% parts by volume ofa soap solution without an excess of free soda is uniformly applied witha brush to the slab and on the top of the first layer. The soap solution; that contains no free soda is produced by dissolving for instance 1 part by weight of-Venetian soap in 5 parts of waten. In order to accelerate the formation of the solution the soap is finely divided up and mixed with the water, which is then heated.

After the Second mixture has been applied to the slab it left to dry during a period MANUFACTURE OF DUTCH TILES OE SLABSHAVJ ING A LUSTEOUS SURFACE AND ARTICLE'PRODUCED THEREBY- papplication filed January 3, 1922. serial noqszavso.

' of say 15-20 minutes whereafter the treated surface of the slab is smoothed by means of a hot, almost red hot, flat iron or the like. This smoothing procedure is continued until the surface 'of the slab is completely smooth and appears to be glazed.

' In order to provide the slabs or tiles with a decorated surface, i. e. to, give the latter the appearance of marble or majolica, to imitate the grain of wood thereon and so on, the necessary colours are added to the first and second mixture whereby any desired pattern effect may be obtained.

Such color effects may advantageously be obtalned by using colored instead of white comininuted marble. These colored marbles are calcareous and enter into a sort of chemical combination with the milk of lime.

The slabs manufactured according to the described process may be utilized in the same size in which they are manufactured, or they may be sawe'l in a known manner like ordinary slabs of asbestos-cement when the slabs are dry.

Slabs manufactured according to the above described method may be utilized for covering walls of kitchens and bathrooms, for tile stoves, roofings, tops of dressing tables and the like. Another feature of the slabs consists in the fact that they are electrically insulating.

I claim:

1. A method for the manufacture of Dutch tiles or slabs having a lustrous surface, comprising applying to a slab made of asbestos-cement when it is still fresh and soft a coating of a mixture of liquid paste of lime and pulverized marble, applying thereafter a coating of a mixture of milk of lime and a soap solution without an excess of soda, and smoothing the surface thus treated.

2. A method for the manufacture of Dutch tiles or slabs having a lustrous surface, comprising applying to a slab made of asbestos-cement when it is still fresh and soft a coating of a mixture of a liquid paste of lime and pulverized marble, smoothing this coating applied, applying thereafter a coating of a. mixture of milk of lime and a soap solution without an. excess of soda, and smoothing the surface thus treated.

3. A method for the manufacture of Dutch tiles or slabs having a lustrous surface, comprising applying to slabs made of asbestos-cement when they are still fresh and soft a coating of a mixture of paste of lime and pulverized marble, applying thereafter a coating of a mixture of milk of lime and a soap solution without an excess of soda, leavin the coating to dry, and smoothing the sur ace of the slab thus treated by means of a hot, almost red hot, iron.

4. A method for the manufacture of Dutch tiles or slabs having a lustrous surface, comprising applying to slabs made of asbestos-cement when they are still fresh and soft a coating of a mixture of a liquid paste of lime and pulverized marble, smoothing the coating applied, applying thereafter a coating of a mixture of milk of .lime and a soap solution without an excess of soda, leaving the coating to dry, and smoothing the surface of the slab thus treated by means of a hot, almost red hot, iron.

5. A method for the manufacture of Dutch tiles or slabs lraving a lustrous surface, comprising applying to a slab made of asbestos cement When it is still fresh and soft a coating of a mixture of a liquid paste of lime and pulverized marble, applying thereafter a coating of a mixture of milk of lime and a soap solution Without an excess of soda, adding colouring matter to at least one of said mixtures for obtaining pattern effects, and smoothing the surface thustreated.

6. An asbestos-cement slab having a surface of milk of lime and comminuted marble.

7. An asbestos-cement slab having a hardened covering of calcium hydrate and comminuted marble and a lustrous finishing coat of soap and calcium hydrate.

In testimony whereof I afiix my si GIOVANNI MADDALENA.

mature. 

